Just added a Network Size metric to the farcaster.network dashboard, which gives a rough approximation of the total size of the network

Was able to do this through a small hubble PR which exposes this info through the API
https://github.com/farcasterxyz/hub-monorepo/commit/c261fba667c5ed477b85c214332393276f95381c

code @ spindl.xyz. Interested in technology, history, and music // farcaster.network

keep in mind this is just the DB size of one hub. in the future we could get a more accurate number by taking the average across several hubs